Louise Roesser earned her BS in ornamental horticulture from Virginia Tech and is the horticulture instructor with Portsmouth Public Schools in Portsmouth, Virginia.

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Find Out Your Garden I.Q. Quiz by Louise Roesser

Are you a garden expert, a weekend gardener or just a novice? Challenge your gardening knowledge by taking this short quiz — you may be surprised to see where you rank. Answers are posted at the end. Good luck!

Can you identify the following plant material?

1. This is what small tree used as a specimen plant in this landscape?

Flowering Dogwood (Cornus florida)

Eastern redbud tree (Cercis canadensis)

Tulip magnolia (Magnolia liliiflora)

2. This is the flower of what common houseplant?

Wax Plant (Hoya carnosa)

Lantana (Lantana montevidensis)

Leek (Allium ampeloprasum)

3. This is what large evergreen shrub or small tree?

Bay (Laurus nobilis)

Ligustrum (Ligustrum sp.)

Anise (Illicium sp.)

4. This is the flower of what herbaceous perennial?

Cabbage rose (Rosa × centifolia)

Azalea (Rhododendron roseum)

Tree peony (Paeonia suffruticosa)

5. This is a must for your garden. What is it?

Woodland Phlox (Phlox divaricata)

Alpine Aster (Aster alpinus)

'Purple Robe' cup flower (Nierembergia caerulea)

Can you identify the following insect damage?

6. You may find this unique-looking caterpillar devouring your parsley. Can you identify it?

Peacock butterfly larvae

Black swallowtail butterfly larvae

Monarch butterful larvae

7. What could cause all this damage to your junipers?

Bagworms

Soda imbalance

Overwatering

8. This pest can turn a Hollywood juniper into an unsightly mess.

Aphids

Spider mites

Mealybugs

Can you identify the following diseases that caused these symptoms?

9. This disease is becoming a big problem on petunias in the South.

Late blight

Erwinia tracheiphila infection

Crown rot

10. You may notice these on your azaleas when the nights are cool.

Ice formations

Leaf gall

Azalea fruit

11. Can you explain what caused the red spots on these leaves?

Entomosporium leaf spot

Paint splatter

Human to plant measles crossover

Test your general knowledge

12. Is an Irish potato a swollen stem or root?

Stem

Root

None of the above

13. If you start a new plant from a cutting, where are the roots typically produced on the cutting?

Middle of stem

At the soil line

The leaf nodes

14. Apples and pears are produced on short, stubby side stems called this name?

Stilettos

Spurs

Wedges

15. Is iron (Fe) considered a macronutrient or a micronutrient?

Micronutrient

Macronutrient

Iron is not a nutrient

16. The bottom, older leaves of your plant are turning yellow. Is this an indication of a zinc deficiency or a nitrogen deficiency?

Salt deficiency

Zinc deficiency

Nitrogen deficiency

17. Which two colors of the light spectrum have the greatest effect on plant growth?

Blue and red

Yellow and green

Orange and red

18. At what temperature does a compost pile need to reach in order to kill most weed seeds and harmful organisms?

212° F

160° F

101° F

19. Is the green lacewing considered a pest or a beneficial insect?

Beneficial insect

Pest

Not an extant species

20. Does the term pesticide only refer to a product that controls insects?

The term "pesticide" should never be used

Yes, it is specific to insect control

No, it's a broad category

21. Where is the best place to store seeds after purchasing and opening them?

In the ground

Sealed plastic bag in a refrigerator

Closed container of liquid fertilizer

22. Branch angles of less than X degrees from the main trunk result in a very high percentage of breakage.

30 degrees

90 degrees

15 degrees

23. When performing gradual rejuvenation on a deciduous shrub, how much of the shrub's growth should be removed the first year?

All, cut to the ground

One-third of oldest branches

None, do not prune

24. What is the best way to keep soluble salts from building up in the soil of your indoor plants?

Allow some water to drain through pot openings

Add a small amount of table salt each month to acclimate plants

Grow all plants hydroponically

25. When potting an amaryllis bulb, how much space should you allow between the bulb and the edge of the pot?

2-3 inches

0.5-1 inch

4+ inches

26. When planning your vegetable garden always locate the taller vegetables on the _____ side of the garden.

North

West

East

27. How often should you have your vegetable garden soil tested?

Every year

Soil tests are a waste of time

Every 3 years

28. How many different varieties of apples should be planted for adequate cross-pollination?

3+

You only need one

5+

29. When is the best time of day to water your lawn?

Midnight

Early morning

Noon

30. How long should supports of newly planted trees be left in place?

One year

Two years

Landscaping trees need to be supported indefinitely

Get Your Score
Now it's time to find out how much you know. Click "Get score" to find out. Be sure to see the detailed answers below.

Let us know how you did by leaving a comment at the bottom of the page.

Score =

0-30%
Your're germinating.

31-46%
Your're sprouting.

47-80%
Your're a seedling.

81-100%
Your're well rooted.

Answers

1. This is an Eastern redbud tree (Cercis canadensis). It features heart-shaped green foliage with deep purple-pink flowers in early spring. Zone 4.

2. This is the flower of a wax plant (Hoya carnosa). This plant makes an excellent hanging basket for your home with little care.

3. This large evergreen shrub is known as anise (Illicium sp.) which prefers a moist, shady location. The leaves contain aromatic oils. Zones 4 to 7.

4. This is the flower of a tree peony (Paeonia suffruticosa), a medium-sized, spreading deciduous shrub with exceptionally large flowers in the spring. Zones 4 to 9.

5. This is 'Purple Robe' cup flower (Nierembergia caerulea), an annual in parts of the south, but hardy in Zones 10 to 11. This plant features fine-textured foliage and bright blue flowers from late spring through fall.

6. This pest is one you can tolerate in your garden because it is the larvae of the beautiful black swallowtail butterfly. Just plant extra parsley for the parsley worm.

7. This pest, the bagworm, can cause extensive damage to junipers, arborvitae, cedar, and other evergreens. Pick off and destroy "bags". Spray with Bt (Bacillus thuringiensis) between May and mid-July.

8. When weather turns hot and dry, be on the look-out for spider mites which caused this discoloration.

9. This is crown rot on a petunia caused by Phytophthora nicotianae.

10. Azalea gall or leaf gall is a common spring disease of azaleas, rhododendrons, and camellias. Hand remove and discard galls or plant resistant varieties.

11. The red spots on this Indian hawthorn are caused by Entomosporium leaf spot. Avoid wetting foliage, especially late in the day.

12. An Irish potato is an enlarged portion of an underground stem. The eyes of a potato are actually the nodes on the stem. Each eye contains a cluster of buds.

13. At the nodes or areas where leaves and buds are attached.

14. Spurs.

15. Iron is essential to enzyme functions but is only needed in small amounts, so it is considered a micronutrient.

The views and opinions expressed in this article are those of the author alone and do not necessarily reflect the views or opinions of State-by-State Gardening, its parent company or affiliates. The author is solely responsible for all content. Our articles are only meant to educate and entertain our readers. We are not medical professionals and cannot recommend the ingestion or topical application of any herbal remedy, poultice, tea, etc. Please consult a medical professional before ingesting any plant.